JPH01116396A - Manufacture of tube joint with flange - Google Patents

Abstract

PURPOSE: To prevent damage of tube and to strengthen the connection of tube and flange by inserting the flange for fixing a machine in a top part of a metal tube, and forming a projective bulge part and a pilot part for inserting. CONSTITUTION: The top part 1a of a metal tube 1 fixed in a hose has a smaller diameter, a flange 2 for fixing a machine is inserted in the top part 1a. Then, while the border part of the top part 1a and the main body of the tube is conically punched, a flange 2 is pressed into the tube main body. After that, the end surface of the top part 1a of the tube is axially pressed, radically projective bulge part 1b and a pilot part 1a' for being inserted into a hose are formed in the top part 1a. As a result, the flange and the tube main body are securely connected and moreover the damages of the surface of the pilot part is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a tape joint with seven flange for use in piping for vehicle air conditioners or other pressure fluid utilization equipment.

(Prior art) In vehicle air conditioners and various hydraulic equipment, one end of a metal tube fitting such as Alsniul is connected to the end of a TM hose, and the other end of the tube fitting is connected to the end of a TM hose in order to supply pressure fluid. Generally, piping is done by attaching it to a mating member, but as shown in FIG.
A flange 2', which is formed by cutting, forging, etc., is formed by cutting, forging, etc., a protruding portion 2b/ with a large diameter is fixed to the tip of the metal tube 1' by brazing, and the pilot part 2&' of the 7 flange 2' is fixed to the tip of the metal tube 1'.
Then, the protruding portion 2b' is fitted into the stepped hole 3a/ formed on the counterpart member 3', and the O-ring 5' is crimped between the outer periphery of the pilot part 2aI and the stepped hole 3a/ to allow the flow to flow. At the same time as sealing the 7 flange 2', the mating member 3
' is fixed with a screw 6', and the tip of the metal tube 1' is inserted through the 7 flange 2', which has a circular recess 2e't- formed in the front as shown in the opening of the figure. Then, the protruding part is held and pressed with a press machine to form a pilot part 2&' and a bulge part 1blyi, and during processing, a half part of the bulge part 1b' is converted into a seven-lung circular recess 2c'. At the same time, the inner base of the bulge part 1b' swells during the natural pressure processing of the bulge part 1b' and is crimped and fixed to the insertion hole of the flange 2', and then the protruding end of the tube 1' and the other half of the bulge part 1b' are attached. 01J ring 5' is pressed between the stepped hole 4' and the outer periphery of the tube tip to seal the flow path and connect the 7 langes 2'. A device is known in which the device is attached to a mating member 3' using a screw 6'.

(Problem to be Solved by the Invention) In the former of the above-mentioned known pipe fittings, the manufacturing process involved cutting the pilot part and the protruding part on the front surface of the 7 flange for fixing. In addition, the 7-lunge must be brazed to the tube, which increases the cost, and brazing has the disadvantage of reducing strength and airtightness due to the heat of 6D, while the latter In this case, no processing is required to provide a pilot part or a protruding part on the 7 lunge.
In addition, since the tape is not brazed, there are no problems such as high cost or reduced strength. However, since the outer surface of the pilot part is grasped and pressed during press processing, it is necessary to press fit between the tube and the clamp. If the press-fitting allowance is made larger, the adhesion between the two will be better, but on the other hand, the surface of the pilot part will become rough due to the strong pressure action, and there is a risk of damaging the O-ring.On the other hand, if the press-fitting allowance is made small, , roughness of the pilot part can be avoided, but there is a drawback that the fixing force between the tube and the 7-kunji is reduced.

In view of these circumstances, the present invention provides a method for manufacturing a tube joint that can obtain a strong connection with a flange without damaging the surface of the pilot part at the tip of the tube, but without causing a decrease in strength or an increase in cost. The purpose is to

(Means for Solving the Problems) Based on the above object, the present invention provides a method for manufacturing a tape joint with seven flange, in which the tip of a metal tube fixed to the tail of a hose member is attached to a main body. 7 flanges for fixing equipment are inserted into the tip of the tube through a coupling hole whose inner diameter is intermediate between the outer diameter of the tip and the main body, and then the tip of the tube is attached to the main body. At the same time, press-fit the flange onto the main body of the tube so that the boundary part with the tube forms an almost conical shape. It is characterized in that the trailing surface of the tip part is pressed in the axial direction, and a bulge part that bulges out in the radial direction and a pilot part to be inserted into the mating member are formed at the tip part.

(Example) Hereinafter, a method for manufacturing a tube joint according to the present invention will be described with reference to FIGS. 1-3.

1 in Fig. 1A is a tube whose rear end is made of a metal such as Al<+Kum, whose rear end is caulked to the end of a rubber hose h for piping with a socket fitting sK, and whose tip 1a is cut or drawn. For installation, the outside diameter d is smaller than the outside diameter d0 of the main body over a range longer than the width of the 7 flange 2, and the opening 2 in the figure is a 7 lange for fixing the equipment. 1 coupling hole 2 & and a circular recess 2 at its front end.
b and an upper screw insertion hole 2C, and the coupling hole 2
The inner diameter d of a is set to be intermediate between the outer diameter d of the tube tip 1a and the outer diameter d0 of the main body.

As shown in FIG. 2A, the tube 1
Grasp the central part of the tube with the two-split 2-ring jig C of the press machine, and from the side, insert a diaphragm with a diameter slightly smaller than the outer diameter d of the tube tip 1& that is almost equal to the fluid passage hole of the mating member. A first forming jig equipped with a hole 11 and an end flare portion 12 presses the tip end portion 1a and the seventh flange 2 toward the clamp fitting C, and the flare portion of the jig D1 is pressed as shown in FIG. 1
2 and the drawing hole 11 so that the boundary between the tip of the deep crystal and the main body of the deep crystal first forms a conical shape with a hollow 9.
At the same time as making the next bulge process easier, the joint hole 2at of the 7 flange 2 is press-fitted onto the main body of the tape, which has a larger diameter.

Next, the tip part 1& of the tube 1, which has been drawn as described above, is fitted with a mortise hole 13 having a slightly larger diameter and shorter than the tip part 1a, as shown in the opening of FIG. A second forming jig equipped with a circular recess 14 having the same diameter as the circular recess 2b applies strong pressure to the end surface in the axial direction without gripping the outer surface of the tip, and presses the end surface at the boundary with the main body. The bulge part 1b and pilot part 11 bulge in the radial direction as shown in FIG.
′ is formed. At that time, the outer diameter of the bulge portion 1b is regulated by the circular recess 2b of the seven flange, and the outer diameter of the pilot portion 1a
The length of / is regulated by the depth of the mortise 13.

In its use, the O-ring 5 is inserted into the pilot part 11' of the tube 1 as usual, and the pilot part 11' is fitted into the fluid passage hole 3aK of the counterpart member 3, while the 7 flange 2 is screwed. It is fixed to the other party member 3 by 6,
As shown in FIG. 3, the O-ring 5 is crimped onto the outer periphery of the pilot part 1a/ and the stepped hole 4 of the mating member 30 to connect the tube joint to the mating member 3.

(Effects of the Invention) As described above, in this invention, the 7 langes are not subjected to extra processing and the tube body is not brazed, so there is no increase in cost or decrease in strength, and the connection hole of the flange is connected to the tip of the tube. The outer diameter of the tip is larger than the outside diameter of the tip, but smaller than the outside diameter of the main body, so that it can be press-fitted onto the main body of the tape. In addition, when molding the bulge part and pilot part, the bulge part is molded without holding the pilot part, so the surface of the pilot part remains smooth without being scratched. This prevents sagging and damage to the O-ring.

[Brief explanation of the drawing]

FIG. 1A is a sectional view of the metal tube. Figure 1 is a cross-sectional view of the 7-lunge. Figure 2A is a process diagram before press-fitting the 7-lunge into the tube. Figure 1 is a process diagram before forming a bulge at the tip of the tube. Figure C is a cross-sectional view of the formed tape joint. FIG. 3 is a cross-sectional view of the state in which it is connected to a counterpart member. FIG. 4A is a sectional view of an example of a conventional tube joint before it is connected to a mating member. 1 is a cross-sectional view of another conventional product coupled to a mating member. In the diagram, 1......Tape 1a...
・Tip part 11'...Pilot part 1b...
Curved bulge part 2...Flange 2a
......Joining hole C......R2 pump jig D+ -D*...1st. Second forming jig patent applicant
Yokohama Eiro Quit 7° Co., Ltd. Agent Makoto
1) True - Figure 1 Figure 2 Figure 2 Figure 2b Figure 3 Figure 4

Claims (1)

[Claims] The tip of the metal tube that is fixed to the end of the hose member is formed to have a smaller diameter than the main body, and a flange for fixing equipment is attached to the tip with an inner diameter that is intermediate between the outer diameter of the tip and the main body. The tube is inserted through the coupling hole, and then the tip of the tube is shaped like a cone with the boundary with the main body converging.
At the same time as the drawing process, the flange is press-fitted onto the main body of the tube, and then the end surface of the tip is pressed in the axial direction without grasping the outer surface of the tube tip, thereby creating a bulge that bulges out in the radial direction at the tip. A method for manufacturing a flanged tube joint, comprising forming a pilot part to be inserted into a mating member.